Geologic Unit: Goose Island

Usage:

basalt of Goose Island (informal) in Ice Harbor Member of Saddle Mountains Basalt of Columbia River Basalt Group (WA*)
basalt of Goose Island (informal) in Ice Harbor Member of Saddle Mountains Basalt of /Yakima basalt subgroup [informal] of Columbia River Basalt Group (WA*)
Also called flows of Goose Island (informal).

Informal. The rank or lithologic term should not be capitalized. [Yakima basalt subgroup considered informal and should not be capitalized. "Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Columbia River Basalt Group adopted by the ID, OR, and WA Geol. Surveys, and the USGS (rules suspended).]

Geologic age:

late Tertiary (late Miocene)*

Type section, locality, area and/or origin of name:

Named from Goose Island, a small island in the Snake River at the type locality of Ice Harbor Member (in SE/4 SE/4 sec. 22, T. 9 N., R. 31 E., Humorist quadrangle, Walla Walla Co., southeast WA) (Swanson and others, 1979).
Reference locality: in quarry 9.5 km northwest of Ice Harbor Dam, in SW/4 SE/4 sec. 29, T. 10 N., R. 31 E., Levey SW quadrangle; drifting sand sometimes makes roads to this quarry impassable to all but 4WD vehicles (Swanson and others, 1979).

AAPG geologic province:

Eastern Columbia basin*